Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors

被引：133

作者：

Wei, Weifeng ^{[1
]}

Cui, Xinwei ^{[1
]}

Chen, Weixing ^{[1
]}

Ivey, Douglas G. ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada

来源：

JOURNAL OF POWER SOURCES | 2009年 / 186卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Electrochemical supercapacitors; Manganese oxides; Electrochemical cyclability; Electrochemical impedance spectroscopy; Morphologicaland structural evolution; MANGANESE OXIDE; PSEUDOCAPACITANCE PROPERTIES; ANODIC ELECTRODEPOSITION; HYDROTHERMAL SYNTHESIS; BEHAVIOR; CAPACITORS; DEPOSITION; FILMS;

D O I：

10.1016/j.jpowsour.2008.10.058

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical cyclability mechanism of nanocrystalline MnO2 electrodes with rock salt-type and hexagonal epsilon-type structures was investigated to determine the relationship between physicochemical feature evolution and the corresponding electrochemical behaviour of MnO2 electrodes. Rock salt MnO2 and hexagonal epsilon-MnO2 electrodes, with fibrous and porous morphologies, evolve into the antifluorite-type MnO2 with a petal-shaped nanosheet structure after electrochemical cycling, similar to that observed in nanocrystalline antifluorite-type MnO2 electrodes after electrochemical cycling. However, a different impedance response was observed for the rock salt MnO2 and hexagonal epsilon-MnO2 electrodes during the charge-discharge cycles, compared with the improved impedance response observed for the cycled antifluorite-type MnO2. A dissolution-redeposition mechanism is proposed to account for the impedance response of the MnO2 electrodes with different morphologies and crystal structures. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：543 / 550

页数：8

共 34 条

[1] Variation of the MnO2 birnessite structure upon charge/discharge in an electrochemical supercapacitor electrode in aqueous Na2SO4 electrolyte [J].

Athouel, Laurence ;

Moser, Francois ;

Dugas, Romain ;

Crosnier, Olivier ;

Belanger, Daniel ;

Brousse, Thierry .

JOURNAL OF PHYSICAL CHEMISTRY C, 2008, 112 (18) :7270-7277

[2] Variations in MnO2 electrodeposition for electrochemical capacitors [J].

Broughton, JN ;

Brett, MJ .

ELECTROCHIMICA ACTA, 2005, 50 (24) :4814-4819

[3] Long-term cycling behavior of asymmetric activated carbon/MnO2 aqueous electrochemical supercapacitor [J].

Brousse, Thierry ;

Taberna, Pierre-Louis ;

Crosnier, Olivier ;

Dugas, Romain ;

Guillemet, Philippe ;

Scudeller, Yves ;

Zhou, Yingke ;

Favier, Frederic ;

Belanger, Daniel ;

Simon, Patrice .

JOURNAL OF POWER SOURCES, 2007, 173 (01) :633-641

[4] Crystalline MnO2 as possible alternatives to amorphous compounds in electrochemical supercapacitors [J].

Brousse, Thierry ;

Toupin, Mathieu ;

Dugas, Romain ;

Athouel, Laurence ;

Crosnier, Olivier ;

Belanger, Daniel .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2006, 153 (12) :A2171-A2180

[5] Microstructure and pseudocapacitive performance of anodically deposited manganese oxide with various heat-treatments [J].

Chang, JK ;

Tsai, WT .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2005, 152 (10) :A2063-A2068

[6] Material characterization and electrochemical performance of hydrous manganese oxide electrodes for use in electrochemical pseudocapacitors [J].

Chang, JK ;

Tsai, WT .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (10) :A1333-A1338

[7] Manganese oxide thin film preparation by potentiostatic electrolyses and electrochromism [J].

Chigane, M ;

Ishikawa, M .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (06) :2246-2251

[8]

Conway B. E., 1999, ELECTROCHEMICAL SUPE

[9] From spinel Mn3O4 to layered nanoarchitectures using electrochemical cycling and the distinctive pseudocapacitive behavior [J].

Dai, Yang ;

Wang, Ke ;

Xie, Jingying .

APPLIED PHYSICS LETTERS, 2007, 90 (10)

[10] High capacitance of electrodeposited MnO2 by the effect of a surface-active agent [J].

Devaraj, S ;

Munichandraiah, N .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2005, 8 (07) :A373-A377

← 1 2 3 4 →